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Old 03-16-2014, 02:47 PM   #1
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How to properly flash this window?


Hi! So I am almost complete with my finish basement project. Only major thing I have left to do is replace this window. Before completing the basement, occasionally the window would leak after heavy rain. We realized it was because the rain from the siding would drop onto the ledge of the window molding and leak into the basement due to poor caulking. I added the little flashing beige flashing which was recommended from an earlier post. Now it's coming time to put a new window in and I would like to make sure it is correctly installed so water does not come in. Ideas? Thanks in advance!

http://imgur.com/a/477zu

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Old 03-16-2014, 08:45 PM   #2
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How to properly flash this window?


First take that silly piece backward siding off.
Install that missing piece of trim on top of the window.
Use a 4-1/2 grinder with a diamond blade and cut into the mortars joint above that top piece of trim and add a piece Z moulding.
Something like this, but with a 1/2 bend at the top to slip into the cut joint.
http://www.bing.com/images/search?q=...ectedIndex=112

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Old 03-18-2014, 09:41 PM   #3
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How to properly flash this window?


IMHO, add the flashing over the window as Joe said, but don't let it in to the concrete wall (with a brick pattern). Just add some flat flashing over the head flash with the top of (the flat flash under the WRB) that is under the vinyl siding. Otherwise the concrete can still wick rain water (between vinyl/head flash) around the let-in edge to the interior= still a leak.

Run both flashings out over/slightly past the side jamb flashing.

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Old 03-23-2014, 07:28 PM   #4
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How to properly flash this window?


I think I understand what you mean Gary. Something like this picture? I do like the idea of not having to cut into the masonry. I also plan on caulking the gap between the wood and the concrete before installing the new window.

This will be the new window.
http://www.lowes.com/pd_113379-1257-...0051&langId=-1

Red = Aluminum drip edge
blue=window
brown=wood frame
green=pvc trim
purple=siding
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How to properly flash this window?-window.jpg  
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Old 03-25-2014, 04:27 PM   #5
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How to properly flash this window?


No, not quite... the WRB must lap over any flashing below, as in 3.1, 8.1, and 9.1 here; http://www.mtcc1170.com/images/BCRainScreen.pdf

The trim board you use between the siding above and the window head flashing must cover a WRB below to shed water down/out properly; http://www.buildingscience.com/docum...d-wall-systems

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